181112131 has 4 divisors (see below), whose sum is σ = 181431000. Its totient is φ = 180793264.

The previous prime is 181112119. The next prime is 181112149. The reversal of 181112131 is 131211181.

181112131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 181112131 - 2¹³ = 181103939 is a prime.

It is a super-2 number, since 2×181112131² = 65603207990722322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 181112099 and 181112108.

It is not an unprimeable number, because it can be changed into a prime (181112171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158581 + ... + 159718.

It is an arithmetic number, because the mean of its divisors is an integer number (45357750).

Almost surely, 2^181112131 is an apocalyptic number.

181112131 is a deficient number, since it is larger than the sum of its proper divisors (318869).

181112131 is an equidigital number, since it uses as much as digits as its factorization.

181112131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318868.

The product of its digits is 48, while the sum is 19.

The square root of 181112131 is about 13457.7907176475. The cubic root of 181112131 is about 565.7820699122.

The spelling of 181112131 in words is "one hundred eighty-one million, one hundred twelve thousand, one hundred thirty-one".